Lee Vaughan of Kidderminster Harriers is attacked by a Stockport County fan during a pitch invasion. Photograph: Action Images

The Football Association will launch another investigation into football violence after pitch-invading fans attacked players and caused a half-hour delay during Kidderminster's Blue Square Premier game at home to Stockport.

The incident occurred when a small group of the 1,500 travelling Stockport fans reacted to their side going behind in the second half at Aggborough Stadium by running on to the field and confronting players from both sides. One player, Kidderminster's Lee Vaughan, was punched before the referee, Michael Bull, intervened to take both teams off the pitch.

Speaking after the game, a 4-0 win for Kidderminster which relegated Stockport, Vaughan called the fan who assaulted him a "disgrace", adding: "I am glad they are going down and I hope they go down again. My son was here today and he had to witness that.

"Coming on to the pitch and assaulting somebody oversteps the mark."

However, Mark Serrell, the Kidderminster chairman, sought to play down the incident, blaming "a very, very small minority" of travelling fans.

"Our stewards and police have worked tremendously hard … yes, of course, we will address any ways in which we might be able to improve but that is perfectly natural. Intelligence from Stockport going into the game told us there was no substantial risk of trouble … unfortunately, you cannot legislate for the mentality of a very, very small minority."

Stockport's chief executive, Ryan McKnight, though, said the home side should be held accountable for the disorder. "They are totally to blame. The game should have been all-ticket and it wasn't policed inside the ground."